393879203897 has 2 divisors, whose sum is σ = 393879203898. Its totient is φ = 393879203896.

The previous prime is 393879203867. The next prime is 393879203933. The reversal of 393879203897 is 798302978393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348585148921 + 45294054976 = 590411^2 + 212824^2 .

It is a cyclic number.

It is not a de Polignac number, because 393879203897 - 2⁶ = 393879203833 is a prime.

It is not a weakly prime, because it can be changed into another prime (393879203867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196939601948 + 196939601949.

It is an arithmetic number, because the mean of its divisors is an integer number (196939601949).

Almost surely, 2^393879203897 is an apocalyptic number.

It is an amenable number.

393879203897 is a deficient number, since it is larger than the sum of its proper divisors (1).

393879203897 is an equidigital number, since it uses as much as digits as its factorization.

393879203897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123451776, while the sum is 68.

The spelling of 393879203897 in words is "three hundred ninety-three billion, eight hundred seventy-nine million, two hundred three thousand, eight hundred ninety-seven".